need help solving this problem

The graph shows the displacement from equilibrium of a mass-spring system as a function of time after the vertically hanging system was set in motion at time t = 0. Assume that the units of time are seconds, and the (1.25, 2). units of displacement are centimeters. The first t-intercept is (0.75, 0) and the first maximum has coordinates (a) What is the period T of the periodic motion? T seconds (b) What is the frequency f in Hertz? What is the angular frequency w in radians / second? J Hertz W radians / second (d) Determine the amplitude A and the phase angle y (in radians), and express the displacement in the form y(t) - A cos(wt - 7), with y in meters. y (t ) - meters (e) With what initial displacement y(0) and initial velocity y '(0) was the system set into motion? y(0) meters y' ( 0 ) - meters / second